The Ahuja CS-451T 5-Inch Ceiling Speaker. The CS-451T is a Compact 5″ ceiling speaker with clamps to flush mount without screws. The Ahuja CS-451T is a 5″ full-range ceiling speaker with 4W/100V. It has a frequency response of 80-15,000Hz, power of 4 W, and impedance of 2.5k/5k/10kO. The speaker is ideal for speech and music in hotels and restaurants.